Use only python3.6 for travis testing

hanslovsky · hanslovsky · commit 6ca45ac4c196 · 2019-01-14T13:51:20.000-05:00
3.7 seems unavailable on travis
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,6 @@ language: python
 jdk: oraclejdk8
 python:
   - "3.6"
-  - "3.7"
 branches:
   only:
   - master
